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參數(shù)資料
| 型號： | ASM805LMJA |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | UP Power Supply Supervisor With Battery Backup Switch |
| 中文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, CDIP8 |
| 封裝： | CERAMIC, DIP-8 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大?。?/td> | 323K |
| 代理商： | ASM805LMJA |
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
rev 1.0
μP Power Supply Supervisor With Battery Backup Switch
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
General Description
The AS690A / AS692A / AS802L / AS802M / AS805L offers
complete single chip solutions for power supply monitoring and
control battery functions in microprocessor systems. Each
device implements four functions: Reset control, watchdog
monitoring,
battery-backup
monitoring. In addition to microprocessor reset under power-up
and power-down conditions, these devices provide battery-
backup switching to maintain control in power loss and brown-
out situations. Additional monitoring capabilities can provide an
early warning of unregulated power supply loss before the
voltage regulator drops out. The important features of these
four functions are:
switching
and
power-failure
1.6 second watchdog timer to keep microprocessor
responsive
4.40V or 4.65V V
CC
threshold for microprocessor reset at
power-up and power-down
SPDT (Single-pole, Double-throw) PMOS switch connects
backup power to RAM if V
CC
fails
1.25V threshold detector for power loss or general purpose
voltage monitoring
These features are pin-compatible with the industry standard
power-supply supervisors. Short-circuit and thermal protection
have also been added. The AS690A / AS802L / AS805L
generate a reset pulse when the supply voltage drops below
4.65V and the AS692A / AS802M generate a reset below
4.40V. The ASM802L / ASM802M have power-fail accuracy to
± 2%. The ASM805L is the same as the ASM690A except that
RESET is provided instead of RESET.
Features
Two precision supply-voltage monitor options
4.65V (AS690A / AS802L / AS805L)
4.40V (AS692A / AS802M )
Battery-backup power switch on-chip
Watchdog timer: 1.6 second timeout
Power failure / low battery detection
Short circuit protection and thermal limiting
Small 8-pin SO package
No external components
Specified over full temperature range
Applications
Embedded control systems
Portable/Battery operated systems
Intelligent instruments
Wireless instruments
Wireless communication systems
PDAs and hand-held equipments
μP / μC power supply monitoring
Safety system
Typical Operating Circuit
Block Diagram
B
+
_
R
1
R
2
0.1 μF
3.6 V
Lithium
Battery
ASM690A
Regulated +5V
Unregulated DC
V
BATT
GND
V
OUT
WDI
PFO
PFI
RESET
V
CC
V
CC
RESET
GND
GND
NMI
I/O LINE
V
CC
CMOS
RAM
Battery-Switchover Circuit
Generator
Timer
V
BATT
V
CC
WDI
PFI
V
OUT
(RESET)
PFO
1.25V
3.5V
0.8V
|+
GND
1
2
3
4
5
6
7
8
|+
|+
|+
-
+
-
+
-
+
-
+
ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L)
Reset
Watchdog
RESET
1.25V
相關(guān)PDF資料 |
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| ASM690 | UP Power Supply Supervisor With Battery Backup Switch |
| ASM690A | UP Power Supply Supervisor With Battery Backup Switch |
| ASM690ACPA | UP Power Supply Supervisor With Battery Backup Switch |
| ASM690ACSA | UP Power Supply Supervisor With Battery Backup Switch |
| ASM690AEPA | UP Power Supply Supervisor With Battery Backup Switch |
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